Basically, every team from No. 4 to 10 except Cincinnati has thought of going back to take advantage of teams trying desperately to get one of the fourth or fifth quarterbacks in Round 1. The Bengals have their own QB and seem less interested, as they have a few needs they'd rather address at No. 5.
There could even be teams behind No. 10 looking to go back for picks. Philadelphia at No. 12 seems willing to move all over the draft board and has already. The Giants are at No. 11 and GM Dave Gettleman has never traded back but there's a first time for everything.